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Experimental: Experimental Explicit

Cannabis user performs visuo-motor rotation tasks informed of an explicit strategy to maximise performance

Behavioral: Visuo-motor rotation

Participant moves a cursor on a screen by sliding a pen over a digital tablet. Participants perform a center-out movement, aiming to a target that appears over one of a set of eight markers radially distributed. In several block of trials, the mapping of the pen position to the cursor is rotated.

Behavioral: Explicit strategy

Participant is provided with an explicit instruction as to how counteract the effects of the visuo-motor rotation via aiming to a marker adjacent target